Electrical regulator.



0' S.-SCHAIRER.

ELECTRICAL REGULATOR. APPLICATION FILED 0015,1911. RENEWED APR. 14. 1915.

Patented July 20, 1915.

warm -n, it 7H r- M's than OTTO S. SCI-IAIRER, OIELEDGEVGQD PARK,EENNSYLVAWIA. ASSIGNOR TO=YVESTING- HOUSE ELECTRIC AND MANUFACTURINGCOMPAI SYLVANIA.

ELECTRICAL REGULAC?QR.

Specification of Letters Patent.

Application filed October 5, 1911, Serial No. 652,997 Renewed April 14,1815. Serial l'lc. 21,-l52.

T all whom it may concern:

Be it known that l, O'r'ro S. SCI-IAIRER, a. citizen of the UnitedStates, and a resident of Edgewood Park, in the county. of Allegheny andState of Pennsylvania, have inventedL a new and useful Improvement inElectrical Regulators of which the following is a specification.

My invention relates to electrical regulators, and it has for its objectto provide a simple and exceptionally eiiective regulator of the kind inwhich the regulation is effected by adjustment of the field excitationof a dynamo-electric machine.

Figure 1 of the accompanying drawing diagrammatically illustrates asystem embodying my invention, and Fi similarly illustrates a systemembodying a modification of the regulator of Fig. l. p

A system in connection with which the present invention may beconveniently em ployed comprises an alternating current generator thearmature 1 of which is connected to a suitable distributing circuit 234.and the field magnet winding 5 of which is supplied with excitingcurrent from the armature G of an exciter. lhe field magnet winding 7 ofthe exciter is preferably shunt excited though it may be supplied withcurrent from any other suitable source, and series tl'ierewith is aresistor 8, the terminals ot which are respectively connected to a pairof cooperating stationary and movable terminal members 9 and 10,1vhichconstitute parts of a relay 11. The movable contact terminal 10 isnormally maintained out of engagement with terminal 9 by means of aspring 12, and is drawn into engagementthereWit-h when an actuatingwinding 13 for the relay is energized, the said winding being suppliedwith currentfrom the exciter, or from any other suitable source.

The circuit of relay-actuating winding 13 is controlled by a pair ofcoiiperating contact terminals 15 and 16, the terminal 15 beingresiliently mounted, as, for instance by being carried at the freeextremity of plate spring 17, the other end of the spring being clampedto a stationary post 18. Ti lie contact terminal 143 is mounted upon oneend of a lever 19 that is pivoted one end to another lever having anintermediate The contact terfulcrum or pivot at 21. minal 16 is normallyheld 111 engagement with terminal 15 by means of a spring 22,

and is adapted to be moved out of engage ment therewith by means of anelectromagnet windingflih havinga core 2- that is secured to the lever19, the movements of the lever 19 and attached parts being somewhatretardedby means of a dash pot The windin 2S and the dash pot arecarried by the lever 20 so that the winding 23 may efl'ect movements ofthe contact terminal 16 independently of any movements of lever 20around its fulcrum point.

The winding 23 is supplied with current from the distributing circuit23-1 through a transformer 26, and its circuit is controlled by tireengagement and disengagement of a pair of coiiperating stationary andmovable contact terminals 27 and v i lhe contact terminals 27 and 28constitute parts of a relay 29 that is similar in construction to therelay 11 and is provided with an actuating winding 30 that is con nectedin parallel with the actuating windinn- 13 of the relay 11, so that itscircuit is controlled in a similarmanner.

'ihe lever 20 is adapted to be moved upon its fulcrum point by means ofan electromagnet winding 32 that is supplied with current proportionalto the voltage or" the circuit 3 l, and is provided with a core 33 thatis suspended from the lever 30. the movements of core 33 and of lever 20being preferably somewhat retarded by means of a dash pot 3:1. Theweight of the core 33 is partially counterbalanced by means of anadjustable counterweight r" While the -various parts of the regulatormay be disposedin any other convenient or desired relation with respectto each other, I prefer the arrangement shown. in which the coil 23 issuspended from the lever 20 directly below its fulcrum point. With thisarrangementno counter-balancing means for the coil is nercssaryand themovements of the coil are minimized with the result that its inertiabecomes a relatively unimportant factor.

As the winding: 32 is continuously supplied 'ith energizing current fromthe circuit 23 l, it serves to alter the position or the lever 20, andalso the distance between contact terminals 15 and 1G. in accordancewitlrvariations of the voltage of the circuit The windin Qi-l beingintermittently eneiyegized so es to move the A CURPORATION OF PENN-Patented duly 2t}, H9353 permitted because the terminal member 15 1sresiliently mounted.

The manner in which the regulator operates will be best understood froma somewhat detailed consideration thereof. If the voltage of the circuit231 becomes reduced,- as, for instance, because of a sudden increase ofload, the winding 32 becomes less strongly energized, with the resultthat the contact terminal 16 is moved closer to the terminal 15. \Vhenthe circuit of the winding 23is interrupted the-spring 22 serves to drawthe contact terminal 16 into engagement with the terminal 15, whereuponthe relay actuating winding 13 and becomes energized, and the contactterminals 10 and 28 are thereby moved into engagement with the terminals9 and 27, respectively. The

engagement of terminals 9 and 10 establishes a shunt to the resistor 8,with the result that the excitation and voltage of the .exciter areincreased, followed by corresponding increases of the excitation andvoltage of the main generator, the increase of the main generatorvoltage serving to compensate for the reduction of the voltage of thecircuit 2-3-4, previously assumed toexist. The increase of the maingenerator voltage causes the winding 32 to be more strongly energized,with the result that the eon tact terminal 16 is raised slightly. Uponeggageme nt of the contact terminals 27 and 28, the winding 23 becomesenergized and tlie'eontact terminal 16 is moved out of engagementwiththeterminal 15, in opposition tothe tension of the spring 22. -When thecontact terminals 15 and 16 are out of engagement,- the relay actuatingwindings 13 and .30 become deenergized and the contact terminals 10 and28 move out of engagement with the terminals 9'and 27, followed bydiminutions of the voltages of the exciter and main generator and bydenergization of the winding 23.

The regulator continues to operate in this manner,'the contact terminal16 being moved into and out. of engagement with terminal 15 by thewinding 23, and the periods of engagement. and disengagement of the saidterminals being determined by the winding Copies otthis patent may beobtained for Me 32 in accordance with variations of the voltage of thedistributing circuit, and in such a manner that the voltage of the saidcircuit will be maintained substantially uniform, and that the saidvoltage will be promptly restored testability and itsnormal value whensudden or violent fluctuations thereof result from any cause. Since, inthe regulator of Fig. l, the coil 23 is located directly below thepivotal point of the lever 22, its movements will be substantiallyentirely .lat eral, and, consequently, the said coil. may bestationarily supported, if desired, instead of being carried by thelever 20, as shown.

In the system of Fig. 2, the coil 28 is mounted upon one end of the mainregulator .lever 37, rather than directly below its ful' crum point, andthe auxiliary lever 38 is mounted upon the same pivot pin as the lever37, but so as to be movable independently thereof, or upon a separatepivot preferably arranged with its axis in alinement with the axis ofthe pivot of the lever 37, though it is not necessarily in alinementtherewith. The connections and operation of the regulator of Fig. 2 arethe same as of the regulator of Fig. 1.

\Vhile the regulator has been shown as adapted to effect voltageregulation only, it will be readily understood thatit is not liniited inits application to such specific use but may be employed, withoutdeparting from the spirit of the invention, for the regulation of anyother electrical. quantity, andin accordance with variations of anyother desired electrical condition, by simple modifications that may bemade by anyone skilled in the art.

I claim as my invention:

1. An electrical regulator comprising 00- operating contact members, anelectromagnetic actuator for one of said members, a lever carrying thesaid actuator substantially directly below its fulcrum, and anelectromagnetic actuator for the lever.

2. An electrical regulator comprising cooperating contact members, alever having a stationary fulcrum carrying one of said members, anelectromagnetic actuator for the said lever, a second lever also havinga stationary fulcrum and carrying the said actuator, and anelectromagnetic actuator for the said second lever.

In testimony whereof, I have hereunto subscribed my name this 29th dayof Sept.

VVnsLnY G. CARR, B. B. I-Invns.

cents each, by addressing the Commissioner of Patents. .Gzington, D. G.

